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+---
+title: Groovy - Updating XML with XmlSlurper
+tags:
+  - IT/Development/Groovy
+---
+
+# Updating XML with XmlSlurper
+
+Here is an example of updating XML using XmlSlurper:
+
+```groovy
+// require(groupId:'xmlunit', artifactId:'xmlunit', version:'1.1')import org.custommonkey.xmlunit.Diff
+import org.custommonkey.xmlunit.XMLUnit
+import groovy.xml.StreamingMarkupBuilder
+
+def input = '''
+<shopping>
+    <category type="groceries">
+        <item>Chocolate</item>
+        <item>Coffee</item>
+    </category>
+    <category type="supplies">
+        <item>Paper</item>
+        <item quantity="4">Pens</item>
+    </category>
+    <category type="present">
+        <item when="Aug 10">Kathryn's Birthday</item>
+    </category>
+</shopping>
+'''
+
+def expectedResult = '''
+<shopping>
+    <category type="groceries">
+    </category>
+    <category type="supplies">
+        <item>Iced Tea</item>
+        <item quantity="6" when="Urgent">Pens</item>
+    </category>
+    <category type="present">
+        <item>Mum's Birthday</item>
+        <item when="Oct 15">Monica's Birthday</item>
+    </category>
+    <category>
+        <item>Wine</item>
+    </category>
+</shopping>
+'''
+
+def root = new XmlSlurper().parseText(input)
+
+// modify groceries: quality items pleasedef groceries = root.category.find{ it.@type == 'groceries' }
+(0..<groceries.item.size()).each {
+    groceries.item[it] = 'Luxury ' + groceries.item[it]
+}
+
+// modify supplies: we need extra pensdef pens = root.category.find{ it.@type == 'supplies' }.item.findAll{ it.text() == 'Pens' }
+pens.each { p ->
+    p.@quantity = (p.@quantity.toInteger() + 2).toString()
+    p.@when = 'Urgent'
+}
+
+// modify presents: August has come and gonedef presents = root.category.find{ it.@type == 'present' }
+presents.replaceNode{ node ->
+    category(type:'present'){
+        item("Mum's Birthday")
+        item("Monica's Birthday", when:'Oct 15')
+    }
+}
+
+// append child at the end of shopping
+root.appendNode {
+    category {
+        item("Wine")
+    }
+}
+
+// delete all occurrences of a specific element inside a specific parent
+root.category[0].item.replaceNode {}
+
+// update the text of a specific element
+root.category[1].item[0] = "Iced Tea"
+
+// check the whole document using XmlUnitdef outputBuilder = new StreamingMarkupBuilder()
+String result = outputBuilder.bind{ mkp.yield root }
+
+XMLUnit.setIgnoreWhitespace(true)
+def xmlDiff = new Diff(result, expectedResult)
+assert xmlDiff.similar()
+
+// check the when attributes (can't do before now due to delayed setting)def resultRoot = new XmlSlurper().parseText(result)
+def removeNulls(list) { list.grep{it} }
+assert removeNulls(resultRoot.'*'.item.@when) == [ "Urgent", "Oct 15" ]
+```
+
+